An NPN-transistor circuit is arranged as shown in figure. It is
A
A common base amplifier circuit
B
A common emitter amplifier circuit
C
A common collector amplifier circuit
D
Neither of the above
[BHU 1994]
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B
A common emitter amplifier circuit
Because emitter $(M)$ is common to both, base $(P)$ and collector $(N)$.
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For a triode $r_p=10 \ kilo \ ohm$ and $g_m=3 \ milli \ mho$. If the load resistance is double of plate resistance, then the value of voltage gain will be